#region (c) 2014 THN Solutions LLC. - All rights reserved
/*
Simplified BSD License (BSD)
THN HTTP Stack Library
Copyright (c) 2014, THN Solutions LLC. ( www.ThnSolutions.com )
Author: Nguyễn, M. Hải                 ( www.Minh-Hai.com     )
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this 
      list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright notice, 
      this list of conditions and the following disclaimer in the documentation 
      and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
POSSIBILITY OF SUCH DAMAGE.
*/
#endregion

#region Record of Change
//             							CHANGE HISTORY
// -------------------------------------------------------------------------------------
// |   DATE    | DEVELOPER  | DESCRIPTION                                              |
// -------------------------------------------------------------------------------------
// | 04-Nov-12 | HaiNM      | First creation.                                          |
// -------------------------------------------------------------------------------------
//
#endregion

#region Record of Audit
//             							REVIEW HISTORY
// -------------------------------------------------------------------------------------
// |   DATE    | REVIEWER   | NOTES                                                    |
// -------------------------------------------------------------------------------------
// -------------------------------------------------------------------------------------
//
#endregion

#region Using directives
using System;
using System.Text;
using Thn;
using Thn.IO;
#endregion

namespace Thn.Net.Http
{
    /// <summary>
    /// A simple to use HTTP response. This class implements interface <see cref="IHttpResponse"/>.
    /// </summary>
#if DEBUG || TESTING
    public
#else
    public
#endif
 class HttpResponse : HttpMessageBase, IHttpResponse
    {
        #region Fields
        #endregion

        #region Properties

        #region Headers
        /// <summary>
        /// Gets or sets reference to the headers section.
        /// </summary>
        public HttpHeaders Headers
        {
            get { return mHeaders; }
            set { mHeaders = value; }
        }
        #endregion

        #region Body
        /// <summary>
        /// Gets reference to the body section.
        /// </summary>
        public IHttpBody Body
        {
            get { return mBody; }
        }
        #endregion

        #region Version
        private string mVersion = HttpVersionValues.Version_1_1;
        /// <summary>
        /// Gets or sets the HTTP version this response uses.
        /// <para>Default is version 1.1</para>
        /// </summary>
        public string Version
        {
            get { return mVersion; }
            set { mVersion = value; }
        }
        #endregion

        #region Date Text
        /// <summary>
        /// Gets or sets the Date header.
        /// </summary>
        public string DateAsText
        {
            get { return Headers[HttpResponseHeaderNames.Date]; }
            set { Headers[HttpResponseHeaderNames.Date] = value; }
        }
        #endregion

        #region Date
        /// <summary>
        /// Gets or sets the Date header.
        /// </summary>
        public DateTime Date
        {
            get { throw new NotImplementedException(); }
            set { DateAsText = string.Format("{0:r}", value); }
        }
        #endregion

        #region Server
        /// <summary>
        /// Gets or sets the Server header.
        /// </summary>
        public string Server
        {
            get { return Headers[HttpResponseHeaderNames.Server]; }
            set { Headers[HttpResponseHeaderNames.Server] = value; }
        }
        #endregion

        #region Content Type
        /// <summary>
        /// Gets or sets the Content-Type header.
        /// </summary>
        public string ContentType
        {
            get { return Headers[HttpResponseHeaderNames.Content_Type]; }
            set { Headers[HttpResponseHeaderNames.Content_Type] = value; }
        }
        #endregion

        #region Content Length
        /// <summary>
        /// Gets or sets the Content-Length header.
        /// </summary>
        public long ContentLength
        {
            get
            {
                return OnGetBodyLength();
            }
            set { Headers[HttpResponseHeaderNames.Content_Length] = value.ToString(); }
        }
        #endregion

        #region Status
        private HttpResponseStatus mStatus = HttpResponseStatus.OK;
        /// <summary>
        /// Gets or sets status code of this response.
        /// </summary>
        public HttpResponseStatus Status
        {
            get { return mStatus; }
            set { mStatus = value; }
        }
        #endregion

        #endregion

        #region On Serialize
        /// <summary>
        /// Write the content of this message to the provided writer.
        /// </summary>
        /// <param name="writer">The write responsible for writing to underlying context.</param>
        protected override void OnSerialize(IContextWriter writer)
        {
            if (mBody.HasData)
            {
                #region Has Data

                long bodyLength = OnGetBodyLength();

                //write status line
                writer.WriteLine(string.Format("{0} {1} {2}\r\n", mVersion, (int)mStatus, HttpResponseStatusCodeAsText.GetText((int)mStatus)));

                //set content-length
                mHeaders[HttpRequestHeaderNames.Content_Length] = bodyLength.ToString();                                

                //write header
                mHeaders.Serialize(writer);

                //add blank line
                writer.WriteLine("");

                //write content
                HttpBody body = (HttpBody)mBody;
                IHasByteArray b = (IHasByteArray)body;
                writer.WriteBytes(b.Buffer, b.StartOffset, (int)body.Length);

                #endregion
            }
            else
            {
                #region No data

                //write status line
                writer.WriteLine(string.Format("{0} {1} {2}\r\n", mVersion, (int)mStatus, HttpResponseStatusCodeAsText.GetText((int)mStatus)));

                //write header
                mHeaders.Serialize(writer);

                #endregion
            }
        }
        #endregion

        #region On Get Body Length
        /// <summary>
        /// Gets number of bytes the body section occupies.
        /// </summary>
        protected override long OnGetBodyLength()
        {
            long result = 0;

            string value = Headers[HttpResponseHeaderNames.Content_Length];
            if (!string.IsNullOrEmpty(value))
            {//value is available from headers
                result = long.Parse(value);
            }
            else if (mBody != null)
            {//value is not available from headers but a body is available
                result = mBody.Length;
            }
            else
            {//give up, can't find any reference
            }

            return result;
        }
        #endregion

        #region Constructors
        /// <summary>
        /// Default constructor.
        /// </summary>
        public HttpResponse()
        { }

        /// <summary>
        /// Create a new instance with the provided status.
        /// </summary>
        public HttpResponse(HttpResponseStatus status)
        {
            mStatus = status;
        }
        #endregion
    }
}
